/******************************************************************************
 * Copyright (C) 2015  671643387@qq.com
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 *****************************************************************************/

#include "AddonHandler.h"
#include <cstdint>
#include <zlib.h>
#include "Shared/Game/Opcodes.h"
#include "Shared/Common.h"
#include "Shared/Log/Log.h"
using NodeCpp::ByteBuffer;

bool AddonHandler::BuildAddonPacket(WorldPacket* _Source, WorldPacket* _Target)
{
	ByteBuffer _AddOnPacked;
	uLongf _AddonRealSize;
	std::uint32_t _CurrentPosition;
	std::uint32_t _TempValue;

	unsigned char _Tdata[256] =
	{
		0xC3, 0x5B, 0x50, 0x84, 0xB9, 0x3E, 0x32, 0x42, 0x8C, 0xD0, 0xC7, 0x48, 0xFA, 0x0E, 0x5D, 0x54,
		0x5A, 0xA3, 0x0E, 0x14, 0xBA, 0x9E, 0x0D, 0xB9, 0x5D, 0x8B, 0xEE, 0xB6, 0x84, 0x93, 0x45, 0x75,
		0xFF, 0x31, 0xFE, 0x2F, 0x64, 0x3F, 0x3D, 0x6D, 0x07, 0xD9, 0x44, 0x9B, 0x40, 0x85, 0x59, 0x34,
		0x4E, 0x10, 0xE1, 0xE7, 0x43, 0x69, 0xEF, 0x7C, 0x16, 0xFC, 0xB4, 0xED, 0x1B, 0x95, 0x28, 0xA8,
		0x23, 0x76, 0x51, 0x31, 0x57, 0x30, 0x2B, 0x79, 0x08, 0x50, 0x10, 0x1C, 0x4A, 0x1A, 0x2C, 0xC8,
		0x8B, 0x8F, 0x05, 0x2D, 0x22, 0x3D, 0xDB, 0x5A, 0x24, 0x7A, 0x0F, 0x13, 0x50, 0x37, 0x8F, 0x5A,
		0xCC, 0x9E, 0x04, 0x44, 0x0E, 0x87, 0x01, 0xD4, 0xA3, 0x15, 0x94, 0x16, 0x34, 0xC6, 0xC2, 0xC3,
		0xFB, 0x49, 0xFE, 0xE1, 0xF9, 0xDA, 0x8C, 0x50, 0x3C, 0xBE, 0x2C, 0xBB, 0x57, 0xED, 0x46, 0xB9,
		0xAD, 0x8B, 0xC6, 0xDF, 0x0E, 0xD6, 0x0F, 0xBE, 0x80, 0xB3, 0x8B, 0x1E, 0x77, 0xCF, 0xAD, 0x22,
		0xCF, 0xB7, 0x4B, 0xCF, 0xFB, 0xF0, 0x6B, 0x11, 0x45, 0x2D, 0x7A, 0x81, 0x18, 0xF2, 0x92, 0x7E,
		0x98, 0x56, 0x5D, 0x5E, 0x69, 0x72, 0x0A, 0x0D, 0x03, 0x0A, 0x85, 0xA2, 0x85, 0x9C, 0xCB, 0xFB,
		0x56, 0x6E, 0x8F, 0x44, 0xBB, 0x8F, 0x02, 0x22, 0x68, 0x63, 0x97, 0xBC, 0x85, 0xBA, 0xA8, 0xF7,
		0xB5, 0x40, 0x68, 0x3C, 0x77, 0x86, 0x6F, 0x4B, 0xD7, 0x88, 0xCA, 0x8A, 0xD7, 0xCE, 0x36, 0xF0,
		0x45, 0x6E, 0xD5, 0x64, 0x79, 0x0F, 0x17, 0xFC, 0x64, 0xDD, 0x10, 0x6F, 0xF3, 0xF5, 0xE0, 0xA6,
		0xC3, 0xFB, 0x1B, 0x8C, 0x29, 0xEF, 0x8E, 0xE5, 0x34, 0xCB, 0xD1, 0x2A, 0xCE, 0x79, 0xC3, 0x9A,
		0x0D, 0x36, 0xEA, 0x01, 0xE0, 0xAA, 0x91, 0x20, 0x54, 0xF0, 0x72, 0xD8, 0x1E, 0xC7, 0x89, 0xD2
	};

	// broken addon packet, can't be received from real client
	if (_Source->rpos() + 4 > _Source->size()) {
		return false;
	}

	*_Source >> _TempValue;                                   // get real size of the packed structure

	// empty addon packet, nothing process, can't be received from real client
	if (!_TempValue) {
		return false;
	}

	if (_TempValue > 0xFFFFF)
	{
		sLog.outError("addon info too big, size %u", _TempValue);
		return false;
	}

	_AddonRealSize = _TempValue;                              // temp value because ZLIB only excepts uLongf

	_CurrentPosition = _Source->rpos();                       // get the position of the pointer in the structure

	_AddOnPacked.Resize(_AddonRealSize);                      // resize target for zlib action

	if (!uncompress(const_cast<::std::uint8_t*>(_AddOnPacked.contents()),
		&_AddonRealSize, const_cast<::std::uint8_t*>((*_Source).contents() + _CurrentPosition),
		(*_Source).size() - _CurrentPosition) != Z_OK)
	{
		_Target->Initialize(SMSG_ADDON_INFO);

		while (_AddOnPacked.rpos() < _AddOnPacked.size())
		{
			std::string _AddonNames;
			std::uint8_t _Unk6;
			std::uint32_t _Crc, _Unk7;

			_AddOnPacked >> _AddonNames;
			_AddOnPacked >> _Crc >> _Unk7 >> _Unk6;

			sLog.outDebug("ADDON: Name:%s CRC:%x Unknown1 :%x Unknown2 :%x", _AddonNames.c_str(), _Crc, _Unk7, _Unk6);

			*_Target << (std::uint8_t)2;

			std::uint8_t _Unk1 = 1;
			*_Target << (std::uint8_t)_Unk1;
			if (_Unk1)
			{
				std::uint8_t _Unk2 = _Crc != UI64LIT(0x1c776d01);    // If addon is Standard addon CRC
				*_Target << (std::uint8_t)_Unk2;
				if (_Unk2) {
					_Target->Append(_Tdata, sizeof(_Tdata));
				}

				*_Target << (std::uint32_t)0;
			}

			std::uint8_t _Unk3 = 0;
			*_Target << (std::uint8_t)_Unk3;
			if (_Unk3)
			{
				// String, 256
			}
		}
	}
	else
	{
		sLog.outError("Addon packet uncompress error");
		return false;
	}
	return true;
}